{Reference Type}: Case Reports {Title}: The medical-legal aspect of sexual deviant behaviors due to brain lesions: A case report and narrative review of the literature. {Author}: Mokhber N;Azarpazhooh MR;Prakash A;Zamprogna Ballès JA;Prakash A; {Journal}: Int J Law Psychiatry {Volume}: 58 {Issue}: 0 {Year}: May 2018 0 {Factor}: 2.479 {DOI}: 10.1016/j.ijlp.2018.01.008 {Abstract}: We reported a case of sexual assault in a 60-year-old male with no history of mental illness. The lack of memory about the time of the assault and the patient's uncharacteristic behaviour suggested sexual deviant behaviour secondary to a brain lesion. Further investigations revealed a lentiform stroke. A possibility of abnormal sexual behaviour due to an epileptic seizure and/or a destructive brain lesion is suggested. We summarized the history of our patient in this paper and provided a review of the medico-legal aspects of hypersexuality and sexual deviant behaviors due to brain disorders.